ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
Suction-Controlled Ring Shear Test of the Silt and Concrete Interface
Provisionally accepted
- 1Zhengzhou University, Zhengzhou, China
- 2Zhengzhou Metro Group Corporation Limited, Zhengzhou, China
- 3Shanghai Urban Construction Municipal Engineering (Group) Co., Ltd, Shanghai, China
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The interface of a structural system in the soil is usually unsaturated. A decrease in the shear strength of the soil-structure interface can degrade the structure, especially under humid conditions. Studying the shear characteristics of the silt-concrete interface using a shear apparatus. Suction-controlled ring shear tests were carried out on the silt-concrete interface for three interface roughness values. The influence of the matric suction (s) and interface roughness (R) on the shear strength index of the silt-concrete interface was analyzed. The test results showed that high values of s and R improved the shear strength of the interface, but the result was affected by the net normal stress (NNS). High values of NNS and R improved the strain-hardening characteristics. NNS, s, and R significantly affected the interface shear shrinkage. The internal friction angle of the saturated interface was smaller than that of saturated silt, whereas the opposite occurred in the unsaturated state. The cohesion and internal friction angle of the interface rose with an increase in R, and they were larger than that of silt. A shear strength model of the silt and interface was established.
Keywords: Unsaturated silt, Suction control, Ring shear test, Interface roughness, Shear Strength
Received: 30 Sep 2025; Accepted: 03 Nov 2025.
Copyright: © 2025 Li, Huang, Ma, Jiang and Ren. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Yonghui Li, liyonghuizzu@163.com
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